video/mp4should be used when you have video content in your file. If there is none, but there is audio, you should use audio/mp4. If no audio and no video is used, for instance if the file contains only a subtitle track or a metadata track, the MIME should be application/mp4.Also, as a server, you should try to include the codecs or profiles parameters as defined in RFC6381, as this will help clients determine if they can play the file, prior to downloading it.
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One of the key advantages of ProRes in the post-world is how well it resists generation loss. The concept of generation loss was everywhere in the analog world. Every time you copied tape or film, there would be a loss of quality. The better the quality of the format and the system, the smaller that loss would be but it would always be there and if you made a copy of the copy, the quality losses would pile up. In a world where this quality loss was an inherent part of the tape-to-tape editing process, part of the magic of the DV format was that you could import via FireWire and edit natively in the DV codec then record back to DV tape with no loss of quality. 2ff7e9595c
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